package com.wzh.mall.cart.interceptor;

import com.wzh.common.constant.AuthServerConstant;
import com.wzh.common.constant.CartConstant;
import com.wzh.common.vo.MemberRespVo;
import com.wzh.mall.cart.vo.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * @program: mall
 * @description:
 * @author: Mr.Wang
 * @create: 2021-10-09 15:23
 **/

// 在执行目标方法之前，判断用户的登录信息  并封装传递给controller目标请求
@Component
public class CartInterceptor implements HandlerInterceptor{


    public static ThreadLocal<UserInfoTo> threadLocal=new ThreadLocal<UserInfoTo>();



    /**
      * @Description: 在目标方法执行之前先执行下面这个方法
      * @Param: [request, response, handler]
      * @return: boolean
      * @Author: Mr.Wang
      * @Date: 2021/10/9
      * @Time: 15:25
      */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        HttpSession session = request.getSession();
        MemberRespVo memberRespVo =(MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        UserInfoTo userInfoTo = new UserInfoTo();

        if (memberRespVo==null){
            //说明用户没有登录

        }else {
            // 用户登陆过了
            userInfoTo.setUserId(memberRespVo.getId());
            Cookie[] cookies = request.getCookies();
            if (cookies!=null&&cookies.length>0){
                for (Cookie cookie : cookies) {
                    // user-key
                    String name = cookie.getName();
                    if (name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                        userInfoTo.setUserKey(cookie.getValue());
                        userInfoTo.setTempUser(true);
                    }
                }
            }

        }
        // 如果没有临时用户  一定要分配一个临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())){
            // 没有临时用户
            String uuid= UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }

        //秒表方法执行之前
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
      * @Description: 业务执行之后
      * @Param: [request, response, handler, modelAndView]
      * @return: void
      * @Author: Mr.Wang
      * @Date: 2021/10/9
      * @Time: 15:42
      */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        UserInfoTo userInfoTo = threadLocal.get();
        // 持续的延长cookie的过期时间
        // 如果没有临时用户 一定保存一个临时用户
        if (userInfoTo.isTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME,userInfoTo.getUserKey());
            cookie.setDomain("mall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }

    }
}
